NCERT Exemplar Solutions Class 10 Mathematics Solutions for Statistics and Probability - Exercise 13.2 in Chapter 13 - Statistics and Probability

Question 2 Statistics and Probability - Exercise 13.2

In calculating the mean of grouped data, grouped in classes of equal width, we may use the formula \overline{x}=a+\frac{f_id_i}{f_i} where a is the assumed mean. a must be one of the mid-points of the classes. Is the last statement correct?


No, the statement is not correct. It is not necessary that assumed mean should be the mid – point of the class interval. a can be considered as any value which is easy to simplify it.

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